GB1532459A - Reverse osmosis membranes - Google Patents

Reverse osmosis membranes

Info

Publication number
GB1532459A
GB1532459A GB31350/76A GB3135076A GB1532459A GB 1532459 A GB1532459 A GB 1532459A GB 31350/76 A GB31350/76 A GB 31350/76A GB 3135076 A GB3135076 A GB 3135076A GB 1532459 A GB1532459 A GB 1532459A
Authority
GB
United Kingdom
Prior art keywords
water
polyamide
salt
solvent
polymer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB31350/76A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Consiglio Nazionale delle Richerche CNR
Montedison SpA
Original Assignee
Consiglio Nazionale delle Richerche CNR
Montedison SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Consiglio Nazionale delle Richerche CNR, Montedison SpA filed Critical Consiglio Nazionale delle Richerche CNR
Publication of GB1532459A publication Critical patent/GB1532459A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
    • C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
    • C08G69/26—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
    • B01D69/10—Supported membranes; Membrane supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
    • B01D69/10—Supported membranes; Membrane supports
    • B01D69/107—Organic support material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
    • B01D69/10—Supported membranes; Membrane supports
    • B01D69/108—Inorganic support material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/06—Organic material
    • B01D71/56—Polyamides, e.g. polyester-amides

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Laminated Bodies (AREA)

Abstract

1532459 Coated semipermeable membrane CONSIGLIO NAZIONALE DELLE RICERCHE 28 July 1976 [30 July 1975] 31350/76 Heading B2E A supported anisotropic reverse osmosis membrane is made by (i) coating a porous base with a water-soluble polymer resistant to temperatures of 80-140‹C to form a support, (ii) spreading on to the support a solution of a polyamide and a water-soluble salt in a water-miscible organic polar solvent that is a non-solvent for the water-soluble polymer, (iii) heating the material to evaporate part of said solvent, and (iv) immersing the material into an aqueous medium to coagulate the polyamide, and to remove the salt, water-soluble polymer and residual solvent. Optionally (v) the final product is heated by immersion in hot water to improve saline rejection. The base may be a woven polypropylene, rayon, vinylidene chloride polymer, acrylonitrile polymer, glass, asbestos, cotton or polyethylene terephthalate fabric in flat or tubular form. In step (i) the polymer may be poly(meth)acrylic acid, acrylic acidacrylamide or -vinylpyrrolidone copolymer, poly (vinyl methyl) ether, poly (meth) acrylamide, acrylamide - dimethylamino (acryl / propyl) amide copolymer, polyvinylpyrrolidone, polyvinyl alcohol, vinylpyrrolidone-vinyl acetate copolymer, methyl cellulose or hydroxy- or carboxy-alkyl cellulose and may be applied as an aqueous solution by dipping for 1 second-1 hour or spreading, and ovendried for 1 min-1 hour at 40-140‹C. In step (ii) the polyamide may be a condensate of piperazine or a derivative thereof with an acid, a phthalic acid-phenylenediamine condensate or one containing a benzimidazolic group, specific examples being given, the salt may be LiCl, LiNO 3 , LiBr, CaCl 2 , ZnCl 2 , MgCl 2 or Mg(ClO 4 ) 2 and the solvent may be di(m)ethyl formamide, di(m)ethyl acetamide, dimethylsulphoxide, N-methyl pyrrolidone or tetramethylsulphone. The solution may contain 5-60 wt. % polyamide, the polyamide: salt wt. ratio being 1:1-10:1. The solution may be applied to a thickness of 0.02- 0.8mm., various spreading techniques including extrusion being specified. In step (iii) evaporation may be carried out in an oven at 40-180‹C for 1 min-3 hours. In step (iv) the aqueous medium may contain salt or alcohol; immersion may be carried out at 0-30‹C for 1-60 mins, e.g. using ice water. In step (v) immersion may be carried out for 1 min-5 hours at 40-100‹C.
GB31350/76A 1975-07-30 1976-07-28 Reverse osmosis membranes Expired GB1532459A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT25908/75A IT1040274B (en) 1975-07-30 1975-07-30 PROCEDURE FOR PREPARATION OF ANISOTROPIC MEMBRANES SUPPORTED FOR REVERSE OSMOSIS BASED ON SYNTHETIC POLYAMIDES

Publications (1)

Publication Number Publication Date
GB1532459A true GB1532459A (en) 1978-11-15

Family

ID=11218105

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31350/76A Expired GB1532459A (en) 1975-07-30 1976-07-28 Reverse osmosis membranes

Country Status (10)

Country Link
US (1) US4230583A (en)
JP (1) JPS6057361B2 (en)
BE (1) BE844637A (en)
CA (1) CA1076427A (en)
DE (1) DE2633812A1 (en)
FR (1) FR2322637A1 (en)
GB (1) GB1532459A (en)
IL (1) IL50135A (en)
IT (1) IT1040274B (en)
NL (1) NL185133C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4454176A (en) * 1981-10-21 1984-06-12 E. I. Du Pont De Nemours And Company Supported reverse osmosis membranes

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DE2808222C3 (en) * 1978-02-25 1981-09-03 Battelle-Institut E.V., 6000 Frankfurt Process for the production of composite membranes
AT375024B (en) * 1978-05-15 1984-06-25 Pall Corp FILTER ELEMENT
JPS57174107A (en) * 1981-04-20 1982-10-26 Teijin Ltd Production of permselective membrane
US4385148A (en) * 1981-06-25 1983-05-24 E. I. Du Pont De Nemours And Company Reverse osmosis membrane preparation
ES516206A0 (en) * 1981-10-21 1983-10-01 Du Pont "IMPROVEMENTS INTRODUCED IN A PROCEDURE FOR THE PREPARATION OF A REVERSE OSMOSIS MEMBRANE".
DE3149976A1 (en) * 1981-12-17 1983-06-30 Hoechst Ag, 6230 Frankfurt MACROPOROUS ASYMMETRIC HYDROPHILE MEMBRANE MADE OF SYNTHETIC POLYMER
JPS59160506A (en) * 1983-02-28 1984-09-11 Kuraray Co Ltd Composite hollow yarn separating membrane and its production
US4828773A (en) * 1987-10-14 1989-05-09 Exxon Research And Engineering Company Highly aromatic anisotropic polyurea/urethane membranes and their use for the separation of aromatics from non-aromatics
US4861628A (en) * 1987-10-14 1989-08-29 Exxon Research And Engineering Company Thin film composite membrane prepared by suspension deposition
US4879044A (en) * 1987-10-14 1989-11-07 Exxon Research And Engineering Company Highly aromatic anisotropic polyurea/urethane membranes and their use for the separation of aromatics from non aromatics
US5028329A (en) * 1989-02-10 1991-07-02 Separem S.P.A. Process for preparing reverse-osmosis membrane, and membrane obtained with the process
US5053133A (en) * 1990-02-09 1991-10-01 Elias Klein Affinity separation with activated polyamide microporous membranes
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KR20000069628A (en) 1996-12-20 2000-11-25 브라이언 디어 Scouring method
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US7819956B2 (en) 2004-07-02 2010-10-26 Siemens Water Technologies Corp. Gas transfer membrane
JP2008505197A (en) 2004-07-05 2008-02-21 シーメンス・ウォーター・テクノロジーズ・コーポレーション Hydrophilic membrane
JP4958779B2 (en) 2004-08-20 2012-06-20 シーメンス・ウォーター・テクノロジーズ・コーポレイション Square MBR manifold system
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CN100548452C (en) 2004-09-15 2009-10-14 西门子水技术公司 The method of incrustation in a kind of membrane filtration system and the control membrane filtration system
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CA2682707C (en) 2007-04-02 2014-07-15 Siemens Water Technologies Corp. Improved infiltration/inflow control for membrane bioreactor
US9764288B2 (en) 2007-04-04 2017-09-19 Evoqua Water Technologies Llc Membrane module protection
JP2010523302A (en) * 2007-04-04 2010-07-15 シーメンス ウォーター テクノロジース コーポレイション Membrane module protection
US20100170847A1 (en) * 2007-05-29 2010-07-08 Fufang Zha Membrane cleaning using an airlift pump
CN106040002B (en) 2007-05-29 2020-01-10 懿华水处理技术有限责任公司 Membrane cleaning using pulsed gas stripping pump
KR20100028116A (en) * 2007-06-28 2010-03-11 지멘스 워터 테크놀로지스 코포레이션 Cleaning method for simple filtration systems
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4454176A (en) * 1981-10-21 1984-06-12 E. I. Du Pont De Nemours And Company Supported reverse osmosis membranes

Also Published As

Publication number Publication date
JPS5216486A (en) 1977-02-07
IL50135A0 (en) 1976-09-30
DE2633812C2 (en) 1987-07-30
NL7608257A (en) 1977-02-01
NL185133C (en) 1990-02-01
CA1076427A (en) 1980-04-29
FR2322637B1 (en) 1982-02-05
DE2633812A1 (en) 1977-02-17
FR2322637A1 (en) 1977-04-01
US4230583A (en) 1980-10-28
NL185133B (en) 1989-09-01
IL50135A (en) 1979-03-12
JPS6057361B2 (en) 1985-12-14
IT1040274B (en) 1979-12-20
BE844637A (en) 1977-01-31

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940728